U-Boot Playmat Eco-Leather

from the publisher:

Play U-BOOT in a bigger surface. Each pack includes an eco–leather mat with foam bottom, waterproof and scratch resistant, 2 mm thick, rollable, foldable, and anti–allergic.

U-BOOT: The Board Game is a real-time tabletop game of WW2 submarine warfare. An underwater cooperative war thriller that allows 1 to 4 players to assume the roles of the Captain, the First Officer, the Navigator, and the Chief Engineer on board of a type VIIC U-boat. The game is enhanced by a companion app, allowing for an unprecedented level of realism, as well as a challenging enemy A.I. to push your skills to the limit.

This is only a accessory! You need U-Boot - The Board Game to play with it.